While auditors rush to finish reviewing ballots in Afghanistan’s disputed June 14 presidential runoff election before incumbent Hamid Karzai leaves office, some American foreign policy experts are looking beyond the political standoff to a deadline that will end U.S. military involvement in the war-torn country.

That, they say, could further complicate Afghanistan’s security.

For years, Washington and Kabul could not come to terms on a bilateral security agreement, which would have determined the scope of what U.S. troops could do after 2014. So in May, U.S. President Barack Obama announced a unilateral plan: The United States would reduce its troop levels while continuing to train and equip Afghan national security forces for another two years.

"By the end of 2016, our military will draw down to a normal embassy presence in Kabul, with a security assistance component, just as we’ve done in Iraq," Obama said in a speech from the White House.

But the president also made it clear that a U.S. presence beyond 2014 would be contingent upon a security agreement, which Karzai has refused to sign. Both Ashraf Ghani and Abdullah Abdullah, the candidates hoping to succeed Karzai, have said they support the pact – but they’re caught up in the country’s political paralysis as United Nations-supervised auditors review roughly 8.1 million ballots.

U.N. and U.S. officials had hoped to have a new president installed by August's end, when Karzai plans to leave office. On Tuesday, Abdullah threatened to pull out of the auditing process because his team believes some fraudulent votes haven’t been discarded.

Deadline disagreements

The Obama administration should have paid attention to realities on the ground in Afghanistan, not on setting deadlines, said Anthony H. Cordesman, a national security analyst at the Center for Strategic and International Studies, a public policy research center in Washington, D.C.

"The chairman of the Joint Chief of Staff advised that the U.S. have a minimum of 16,000 troops" serving as advisers, enablers and the counter-terrorism force in Afghanistan, Cordesman said. The chiefs "had wanted that force potentially to stay there for as long as they are needed rather than be part of some fixed deadline."

Cordesman said Obama has called for inadequate support in deciding to deploy 9,500 troops in 2015 and only half that many in 2016.

Security agreement expected

Former American diplomat Paul Russo – who served as a U.S. ambassador and as special assistant to former U.S. President Ronald Reagan – teaches a Georgetown University course on the modern presidency. He agrees with Obama’s timetable, but said the pullout ultimately hinges on the security agreement.

He said he’s optimistic that Washington and Kabul will sign a pact “and also that we will leave 10- to 12,000 troops for training and assistance for a 10-year period in Afghanistan.”

Ghafoor Lewal, director of Afghanistan’s Center for Strategic Studies in Kabul, contends the United States has come too far in Afghanistan to make a U-turn.

"Afghanistan is too important a place from a strategic point of view," he said, "and if NATO and [the] U.S. resort to an irresponsible pullout from the country without paying attention to realities on the ground, any possible civil war in Afghanistan will not remain within the Afghan borders."

Lewal said insecurity in Afghanistan would have a domino effect on the region and eventually the world.

Will Afghanistan follow Iraq?

Some fear that Afghanistan will face the same upheaval that Iraq has since the United States pulled out its combat troops.

When Baghdad failed to sign a status of forces agreement with Washington in 2011, the United States picked the “zero option” and removed all its fighting forces from Iraq. Three years later, the extremist Islamic State militant group has captured large swaths of areas in north of Iraq and made advances in eastern Syria as well.

Some fear that Afghanistan may experience the current insecurity of Iraq as well if things go wrong.

Lisa Curtis, a South Asian expert at the conservative Heritage Foundation in Washington, believes that the Islamic State poses as great a danger to the region as the Taliban does.

The Islamic State "is a breakaway faction of al-Qaida, and of course the al-Qaida located in Pakistan’s tribal areas is supporting the Afghan Taliban in Afghanistan. So you still have the al-Qaida Taliban alliance," Curtis said.

Obama wants to be remembered as the president who ended two wars, she said, but she warned his approach could backfire.

"If he doesn’t adopt sound policies to deal with challenges that we face in both Iraq and Afghanistan, he could actually end up with a legacy of being the U.S leader who allowed parallel jihadist movements to succeed in two pivotal parts of the world," Curtis said.

Others disagree with Curtis, seeing Iraq and Afghanistan as fundamentally different scenarios.

"I think Afghans have not decided about the fate of the U.S forces in their country the way Iraqis did," said Lewal, who added that he expects Afghanistan’s next president “will soon sign” a security pact with the United States. "Afghanistan is far more important to U.S national security interests than Iraq is."

Russo agrees with Lewal.

"I think it’s altogether a different situation in Afghanistan and I think that those who are comparing the two are missing a lot of the finer points," Russo said.

U.S. public’s support for war wanes

The United States has been fighting in Afghanistan for 13 years, making this the longest war in U.S. history, and the public has grown weary. Given its flagging support, how willing is the U.S. Congress to financially support the Afghanistan mission beyond 2016 – especially if there is no bilateral security agreement?

Heritage’s Curtis said the U.S. should remain in Afghanistan as long as its help is needed.

"I realize there are financial pressures, but what we have heard from several congressional members is they would like to see President Obama reconsider this withdrawal strategy from Afghanistan and keep [the] options open," she said.

She said Afghanistan deserves a commitment of at least 10,000 troops. She pointed out that the United States has provided at least 28,500 troops to South Korea for decades.

But Cordesman, the national security analyst, said Afghan’s needs go beyond military support. He said its civil dimension was critical, requiring attention from the Afghan government and the international community.